<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      let username = "lili";
      let uid = username;
      console.log("username:", username, "uid:", uid); //lili lili
      uid = "jack";
      console.log("username:", username, "uid:", uid); // lili jack
    </script>
  </body>
</html>
